CN106092809B - A kind of unsaturated soil suction field measurement apparatus based on filter paper method - Google Patents
A kind of unsaturated soil suction field measurement apparatus based on filter paper method Download PDFInfo
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- CN106092809B CN106092809B CN201511004694.7A CN201511004694A CN106092809B CN 106092809 B CN106092809 B CN 106092809B CN 201511004694 A CN201511004694 A CN 201511004694A CN 106092809 B CN106092809 B CN 106092809B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
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Abstract
The invention discloses a kind of unsaturated soil suction measurement device based on filter paper method, including take native pipe, casing, measurement pipe, filter paper insertion apparatus, small-sized cut native knife, filter paper isolating device.Described that soil pipe and measurement pipe is taken to be embedded in casing, the upper end of described sleeve pipe is equipped with rubber ring, and on the upper side equipped with semi-ring shaped opening at middle part.Filter paper is placed on the filter paper insertion apparatus, and it is inserted into described sleeve pipe semi-ring shaped opening, take filter paper insertion apparatus away, measurement pipe is pushed to be close to soil sample with soil sample, after the moisture balance of a period of time filter paper and soil, filter paper is taken out, its moisture content is measured, according to the moisture content of filter paper and suction curve, suction in soil is calculated.
Description
Technical field
The present invention relates to a kind of unsaturated soil suction field measurement apparatus based on filter paper method belongs to Geotechnical Engineering neck
Domain.
Background technique
The size of suction is an important factor for influencing unsaturated soil property in unsaturated soil, and the variation of suction directly affects soil
Infiltration and the properties such as mechanics.Total suction of unsaturated soil includes matric suction and osmotic suction two parts.Accurate measurement is non-full
It is the pith for studying unsaturated soil with the suction in soil.At present the measurement method of unsaturated soil suction mainly have filter paper method,
Thermocouple psychrometer method, tensometer method etc..Filter paper method is due at low cost, the advantages that suction measurement range is big, and has measurement base
The function of matter suction and total suction, and be widely used, principle is: filter paper can pass through steam with the soil with certain suction
Exchange reaches balance, according to the relation curve of the suction of the filter paper of calibration and moisture content, can extrapolate suction.
Currently, due to not having the equipment using filter paper method measurement soil body suction, the experiment carried out using this method is equal
For interior.Tested however, undisturbed soil is either taken to transport to laboratory, or tested with manipulated soil, soil sample into
It not can avoid biggish artificial disturbance before row test, and then affect the measurement of suction in the soil body, so that measured result
The more difficult real suction value for reflecting the live soil body.
Summary of the invention
The present invention provides a kind of unsaturation soil body suction field measurement apparatus based on filter paper method, test site is not
Together, indoor measurement and in-site measurement may be implemented, can not only measure total suction of unsaturated soil, matrix suction can also be measured
Power.
The technical scheme adopted by the invention is as follows:
A kind of unsaturated soil suction measurement device based on filter paper method, including take native pipe, casing, measurement pipe, filter paper insertion
Device small-sized cuts native knife, filter paper isolating device；Described that soil pipe and measurement pipe is taken to be embedded in casing, the upper end of described sleeve pipe is set
There is rubber ring, and on the upper side equipped with semi-ring shaped opening at middle part, filter paper is placed on the filter paper insertion apparatus, and be inserted into the set
In pipe semi-ring shaped opening, filter paper insertion apparatus is taken away, measurement pipe is pushed to be close to soil sample with soil sample, a period of time filter paper and soil
After moisture balance, filter paper is taken out, its moisture content is measured, according to the moisture content of filter paper and suction curve, calculates suction in soil.
Further, described to take soil pipe be stainless steel rounding pipe, and bottom is wedge type, and top is nested in protrusion snap ring
In described sleeve pipe.
Further, the measurement pipe is steel round tube or aluminum tube, and top is equipped with rubber ring, is inserted in described sleeve pipe,
And movement can be pulled and pushed in described sleeve pipe.
Further, the measurement pipe top can be fixedly connected on drilling rod.
Further, described sleeve pipe is steel pipe or hard lucite tube, and bottom is wedge type, and top is by bolt and surveys
Buret is fixedly connected.
Further, it sets in the middle part of described sleeve pipe there are two the rectangular opening penetrated through, is provided with semicircular at the 2cm of rectangular opening top and opens
Mouthful, it is open with a thickness of 5mm.
Further, described sleeve pipe relative to the measurement pipe in it and can take native pipe to rotate.
Further, the filter paper insertion apparatus is forked type structure, interior to be equipped with card slot.
Further, it is described it is small-sized to cut native knife be high-strength stainless steel blade, with a thickness of 2mm, can be inserted into described sleeve pipe
It is in the perforative rectangular opening in portion and fixed.
Further, filter paper isolating device is disk with holes, and material is organic glass or rigid plastics, with a thickness of 4mm,
It can be laid flat in measurement pipe by the upper opening of described sleeve pipe.
A kind of unsaturated soil suction on-site measurement method based on filter paper method, drills out certain depth in trial zone with drill
Hole, be then fixed on described on drilling rod based on filter paper method unsaturated soil suction field measurement apparatus, be pressed down against drilling rod
Drilling rod in field measurement apparatus indentation soil, will be promoted, and field measurement apparatus is got into earth's surface or opening exposing ground
Table, insertion is small-sized to cut native knife and revoling tube, shears soil sample, three filter paper that then will be cut out and handle well are put into tweezers
In measurement pipe and filter paper is compressed, and is inserted the device into hole, or is transported to laboratory, after a period of time, the soil of filter paper and surrounding
After the water-vapor exchange balance of body, measuring device is taken out, and therefrom goes to take out filter paper, carries out weighing measuring and calculating.
A kind of unsaturated soil suction field measurement apparatus based on filter paper method of the present invention, have the beneficial effect that
(1) present invention can substitute the function of part undisturbed soil soil sampler, and realization measures after taking soil, reduce extraneous factor
Disturbance to the soil body；
(2) measurement pipe and native pipe is taken to be nested in casing in the present invention, and is equipped with rubber ring on measurement pipe top, entirely taken
Soil and measurement process are carried out in opposite closed environment, ensure that the water characteristic of undisturbed soil；
(3) by be inserted into the small rectangular opening that is penetrated through on casing it is small-sized cut native knife, and turnbarrel is completed to undisturbed soil
Cutting and the preparation of soil sample, the area that the soil body is contacted with external equipment is minimized, effectively avoids undisturbed soil disturbed；
(4) measurement pipe can carry out pulling and pushing movement in casing, filter paper can be compressed by pulling and pushing, to avoid because of filter paper
Bad caused suction measurement error is bonded with the soil body；
(5) being put into the process for filter paper is put by filter paper insertion apparatus, and the fold during avoiding filter paper from being put into is existing
As；
It (6) can be by being put into measurement of the filter paper isolating device realization to the matric suction of undisturbed soil；
(7) the configuration of the present invention is simple, it is easily operated, it is easy to use, and manufacturing cost from taking soil to operate continuously to measurement
It is low, it is suitble to promote and apply.
Detailed description of the invention
Fig. 1 unsaturated soil suction measurement device the schematic diagram of the section structure.
Fig. 2 unsaturated soil suction measurement device left and right side view.
Fig. 3 filter paper insertion apparatus structural schematic diagram.
Fig. 4 filter paper isolating device schematic diagram.
Fig. 5 unsaturated soil suction measurement device measurement method schematic diagram.
In figure: 1-takes native pipe, 2-measurement pipes, 3-casings, 31-- semicircular rings shaped opening, 32-through holes, 33- rubber
Cushion rubber, 34-bolts, 4-filter paper insertion apparatus, 5-it is small-sized cut native knife, 6-filter paper isolating devices, 7-undisturbed soil samples, 8-filters
Paper, 9-sealant tapes.
Specific embodiment
As shown in figure 3, a kind of unsaturated soil suction field measurement apparatus based on filter paper method, including take native pipe 1, measurement pipe
2, casing 3, filter paper insertion apparatus 4, small-sized cut native knife 5 and filter paper isolating device 6.Native pipe 1 and measurement pipe 2 is taken to be embedded in casing 3
In, 3 upper inner of casing is equipped with rubber ring 33, and rubber ring 33 is closely connect with measurement pipe 2；At the top of casing 3 by bolt 34 with
Measurement pipe 2 is fixedly connected, and 3 inside middle of casing is equipped with card slot, and it is running through for long 1cm high 3mm that 3 card slot top of casing, which is provided with diameter,
Rectangular opening 32 at 32 top 2cm of rectangular opening, is provided with semicircle annular aperture 31；Remove bolt 34, casing 3 and take native pipe 1, survey
Buret 2 can relatively rotate, and measurement pipe 2 can be realized in casing 3 and pull and push piston motion.
First with drill in one hole of test site ground auger, depth is design measurement test depth, is then lifted out drill,
And be fixedly connected with drilling rod with the top of unsaturated soil suction measurement device, unsaturation suction measurement device is put into hole, and
Static pressure or rotation slowly promote unsaturated soil suction measurement device extremely in unsaturation suction measurement device indentation test soil layer
Earth's surface or opening expose earth's surface, and completion takes geotechnological work.Small-sized cut of hard is run through into rectangular opening 32 in the middle part of the native insertion of knife 5 casing 3
In, and fixation, bolt 34 is removed, revoling tube 3 one is enclosed to realize to the cutting of soil sample 7 in measurement pipe 2, above pulls out measurement pipe
2, to 3 top semicircular rings shaped opening of casing, 31 top, will be equipped with the filter paper insertion apparatus 4 of filter paper, be inserted into semicircle ring-type and open
In mouth 31, and measurement pipe 3 is touched downwards, so that measurement pipe 3 is pressed on filter paper insertion apparatus 4, gently extract filter paper insertion apparatus
10, and filter paper 8 is stayed in measurement pipe 3, push measurement pipe 2 downwards, and extract it is small-sized cut native knife 5, with 9 sealing sleeve pipe 3 of adhesive tape
Rectangular apertures 32 are run through at middle part, measurement pipe 2 are further pushed, so that filter paper is tightly attached on the soil body 7 taken in native pipe 1, then
3 top semicircular rings shaped opening 31 of casing is sealed with adhesive tape 9；According to experimental design, measuring device is taken into native 1 lower seal of pipe
It takes back laboratory or directly measuring device is embedded in hole, after a week, after the moisture balance of filter paper and soil, open set
Pipe takes out rapidly filter paper and carries out measuring its moisture content, calculates unsaturated soil according to the moisture content of calibration and suction relation curve
Matric suction.
Or in above-mentioned steps, before being inserted into filter paper into unsaturated soil suction measurement device, first the filter paper is isolated and is filled
It sets in 6 insertion casing, 3 top semicircular rings shaped opening 31, then separately takes one piece of filter paper isolating device 6 and make its bottom and filter paper
It is connected, is put into filter paper insertion apparatus 4 together, and filter paper insertion apparatus 4 is inserted into semicircular rings shaped opening 31, and downwards
Touch measurement pipe 3, so that measurement pipe 3 is pressed in filter paper isolating device 6, gently extract filter paper insertion apparatus 4, and by filter paper 8 and
Filter paper isolating device 6 stays in measurement pipe 3, downwards push measurement pipe 2, and extract it is small-sized cut native knife 5, with rubber belt sealing casing 3
Rectangular opening 32 is run through at middle part, further pushes measurement pipe 2, so that filter paper is pressed on the filter paper isolation dress being put into measurement pipe 2
It sets on 6, is then sealed 3 top semicircular rings shaped opening 31 of casing with adhesive tape；According to experimental design, measuring device is taken into native pipe
1 lower seal takes back laboratory or directly measuring device is embedded in hole, after a week, the moisture balance of filter paper and soil
Afterwards, casing 3 is opened, filter paper is taken out rapidly and carries out measuring its moisture content, calculated according to the moisture content of calibration and suction relation curve
Total suction of unsaturated soil.
Claims (4)
1. a kind of unsaturated soil suction measurement device based on filter paper method, including take native pipe, casing, measurement pipe, filter paper insertion dress
It sets, small-sized cut native knife, filter paper isolating device；Described that soil pipe and measurement pipe is taken to be embedded in casing, casing can be opposite in it
Measurement pipe and take native pipe to rotate, the measurement pipe top can be fixedly connected on drilling rod.
2. a kind of unsaturated soil suction measurement device based on filter paper method according to claim 1, it is characterised in that: described
Taking soil pipe is stainless steel rounding pipe, and bottom is wedge type, and top is nested in described sleeve pipe with protrusion snap ring.
3. a kind of unsaturated soil suction measurement device based on filter paper method according to claim 1, it is characterised in that: described
Measurement pipe is steel round tube or aluminum tube, and top is equipped with rubber ring, is inserted in described sleeve pipe, and can pull and push in described sleeve pipe
It is mobile.
4. a kind of unsaturated soil suction measurement device based on filter paper method according to claim 1, it is characterised in that: described
Casing is steel pipe or hard lucite tube, and bottom is wedge type, and top is fixedly connected by bolt with measurement pipe, in the middle part of casing
If being provided with semi-ring shaped opening at the 2cm of rectangular opening top there are two the rectangular opening penetrated through, it is open with a thickness of 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511004694.7A CN106092809B (en) | 2015-12-29 | 2015-12-29 | A kind of unsaturated soil suction field measurement apparatus based on filter paper method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511004694.7A CN106092809B (en) | 2015-12-29 | 2015-12-29 | A kind of unsaturated soil suction field measurement apparatus based on filter paper method |
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| Publication Number | Publication Date |
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| CN106092809A CN106092809A (en) | 2016-11-09 |
| CN106092809B true CN106092809B (en) | 2019-01-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106908344A (en) * | 2017-03-07 | 2017-06-30 | 长安大学 | A kind of filter paper method measures the device and method of unsaturated soil matric suction |
| CN107421847A (en) * | 2017-05-17 | 2017-12-01 | 中南大学 | A kind of total suction real-time measurement apparatus of unsaturation soil layer and its measuring method |
| CN109633131B (en) * | 2019-01-29 | 2021-05-14 | 长沙理工大学 | Temperature-controllable and pressure-controllable soft rock matrix suction balancing device and matrix suction measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103018128B (en) * | 2012-12-28 | 2015-04-15 | 中南大学 | Different-layer unsaturated soil total suction in situ measurement device and manufacturing method thereof |
| CN203745228U (en) * | 2014-01-16 | 2014-07-30 | 昆明理工大学 | Sampling tube for taking undisturbed soil sample from soft soil |
| CN104792969B (en) * | 2015-04-22 | 2016-08-31 | 三峡大学 | A kind of soil suction value on-site wireless based on Temperature Humidity Sensor measures system |
| CN104777060B (en) * | 2015-04-22 | 2017-08-01 | 三峡大学 | A kind of total suction field measurement apparatus of soil based on filter paper method |
| CN205246470U (en) * | 2015-12-29 | 2016-05-18 | 山东科技大学 | On --spot measuring device of unsaturated soil suction based on filter paper method |
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